and after upgrading to the iPad baseband, started seeing "No Service". Wifi and GPS both work fine. The original SIM card is in place. Is it true that if it won't recognize any carriers with that in place, a new one won't work either?

I read that I should try to let iTunes upgrade from OS 4.1 to 4.2, but it wouldn't allow it (said the phone is ineligible). I have no idea what else to do to.

Found this on the first page of instructions I followed, and I somehow neglected to read it: "Theres an error in the bundle for the iPhone3GS 4.1 that prevents the new baseband from being used. If you know your way around OSX, please download the fixed bundle, and unzip it if Safari hasnt already done so. Then Show Package Contents of PwnageTool.app, navigate to Contents->Resources->FirmwareBundles and drop it there. Otherwise, please wait for the updated PwnageTool, or the OSX version of redsn0w coming soon."

Okay, so I didn't do this, and am not sure how to do it now. I can see the package contents but can't move anything into the folder to add it as mentioned above.

It mentions the updated Pwnage Tool - current version is 4.3.3. Can I use that version, or do I need to find the update that followed 4.1.3? If the latter, am I looking for v4.1.4?

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